Agilent Technologies 8453 Operator's Manual page 30

Corrective action
Diagnostics and Troubleshooting
General Troubleshooting Hints
carriage should slide freely.
If excessive force is required to move the carriage when the belt is
disconnected, either the multicell transport shafts are misaligned (or
defective), or the carriage assembly is defective.
To determine if the shafts are misaligned, temporarily loosen the clamp
screw on the short shaft. If the carriage can be moved freely when this
shaft is loose, the original alignment problem must be corrected by
empirically determining a shaft position that results in normal carriage
movement. If the carriage cannot be moved freely when the shaft is loose,
either the shafts or the carriage assembly is defective.
3 Replace the belt in the belt grip and hold the belt tensioner in place, then
use the software to move the carriage back to the HOME-position. If the
carriage moves normally, reassemble the transport base and cell holder
and test operation again.
If the carriage does not move, and the sound of the motor cannot be heard
after sending a software instruction to move the carriage, refer to "Checking
the Electronics" on page 31 to troubleshoot the cable and the motor.
Multicell Transport not Accessible from Agilent ChemStation
Software
1 Make sure the multicell transport cable is connected to the multicell
transport connector at the rear of the spectrophotometer.
2 The multicell transport cable connector must have a short circuit between
pins 1 and 6, see "Checking the Electronics" on page 31 to troubleshoot the
cable.
3 The spectrophotometer processor main (SPM) board is defective.
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